Since firmware update 7.5.2, erratic powering down.

Since I updated my firmware from 7.3.2 to 7.5.2 two weeks ago, I have been experiencing poor performance. The reason I was still on 7.3.2 was because 7.4.2 gave me erratic connections, and thus I rolled my firmware back to 7.3.2. I tried doing the same this time, but the Airport Utility is not offering anything but 7.5.2, and the 7.3.2 firmware was deleted from my system when 7.5.2 was installed. The Airport Utility is refusing to offer 7.4.2 or the 7.3.2 firmware.
My setup:
I do not have special settings like a VPN or things like that. I have the Airport Extreme connected to my cable modem, and the Airport Express on the other side of the house. The Airport Extreme creates a network, and the Airport Express extends that network. The network is using a WPA2 password. Channel 7 is being used because that's best for my area.
My problems:
- Random disconnects, which start at the Airport Extreme and spread to the Airport Express.
- The Airport Express has been shutting down on its own randomly, must unplug and replug several times in order for it to come back on.
- This morning, my Airport Extreme started showing the same behavior.
I have owned these devices for going on 3 years. This is a new problem, because I never had problems before. I was ready to buy another Airport Express because I thought it had started dying; but when my Airport Extreme started showing the same behaviors this morning I was alarmed. It has happened twice since this morning.
Please help! Or provide any information you know about this.

Have you tried to download via...select Airport Utility in the Finder>click on "Airport Utility"> on the drop down menu click on "Check for updates" as you hold down the Option key. Down load the version you want...then upload and install using Manual Setup>click on "Version", third line from top. Good Luck, RJB
BTW: I'm running Airport Utility, 5.5.2

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